Audio out of sync after conversion

[user2008]

I've downloaded a DVD, VIDEO_TS and AUDIO_TS folders, played in VLC MP without any problem. A perfect DVD.

I want to convert it to xvid, and as usual(I'm a bit familiarized with these things), opened the file VTS_01_1.VOB in Virtualdub(mpeg-2 plugin), selected "direct stream copy" in the audio menu and "full processing mode" > "compression", xvid in the video menu.
Clicked on file> save as avi.

The audio in this avi is out of sync. :S
It's about 5 seconds.

Later I installed Auto Gordian Knot, version 2.55, opened VTS_01_1.VOB and clicked on the preview button.
The same thing happened: audio out of sync. What is that??

Here's some information generated by Auto Gordian:
[11/11/2010 22:19:48] Source resolution: 720x480
[11/11/2010 22:19:48] Found NTSC source.
[11/11/2010 22:19:48] Source aspect ratio: 4:3
[11/11/2010 22:19:48] Source seems to be pure FILM.

It says 4:3. Actually it's 16:9.

And VLC MP shows: audio: a52 audio(aka AC3) (a52)
48000hz

I appreciate any help.

[jagabo]

Use the audio skew feature in VirtualDub to re-sync the audio. It's in the audio interleaving dialog.

[manono]

If the DVD is 16:9 and the VOBs themselves are really 4:3, you can get AutoGK to treat it as 16:9 in the Hidden Options (CTRL-F9). Your synch problem is probably a direct result of you downloading the movie from someone that didn't decrypt it properly. Easiest is to take jagabo's suggestion to find out the exact amount it's out of synch and then fix it. If starting over again, first running the VOBs through FixVTS might fix it. The fact that the XviD is out of synch has nothing to do with the DVD itself playing in synch.

[user2008]

Thanks for the tips. The audio skew feature in VD didn't work.

Based on manono's suggestion, I was wondering if DVD shrink could fix the problem and it really did. Solved.

[manono]

The audio skew feature in VD didn't work.

I'm happy you solved your problem, but if applying a delay using VDub didn't work then you didn't do it correctly. This assumes the audio is off by the same amount all the way through. If the audio trails the lips moving, you apply a negative delay. It's in milliseconds and 1000 ms = 1 second. Many people trying to fix it without success don't realize that and apply an audio skew too little to make an obvious difference.

Yes, running it through DVDShrink can be an alternative fix to using FixVTS on it.

[PuzZLeR]

As a payware solution, running it through VideoReDo (Tools -> QuickStream Fix... ) cures alot of such problems too.

As an aside, personally, I pull all video and audio streams fully before any DvD -> Anything encode (unless I want to "shrink it", which is a useless task IMO).

It's less headaches, and more manageable, than doing it from all those VOB files. This way I see everything step-by-step, pick and choose what I want, even edit, and can better diagnose any problems that may arise at any level.